G Henry and Hiro are both very strong engines, but one day as they are working together they both start to billow dark smoke from their funnels. Duck tells them they have taken on some of the bad coal.

G Scruff works with Whiff at the Waste Dump collecting rubbish trucks. When the Fat Controller sees how rusty and dirty Scruff looks, he insists that he goes straight to the Steamworks to be repainted.